This article is about the undifferentiated tissue. For other uses, see Thallus (disambiguation).
"Thalli" redirects here. For the Indian village, see Thally.
Thallus (pl.: thalli), from LatinizedGreekθαλλός (thallos), meaning "a green shoot" or "twig", is the vegetative tissue of some organisms in diverse groups such as algae, fungi, some liverworts, lichens, and the Myxogastria. A thallus usually names the entire body of a multicellular non-moving organism in which there is no organization of the tissues into organs.[1] Many of these organisms were previously known as the thallophytes, a polyphyletic group of distantly related organisms. An organism or structure resembling a thallus is called thalloid, thallodal, thalliform, thalline, or thallose.
Even though thalli do not have organized and distinct parts (leaves, roots, and stems) as do the vascular plants, they may have analogous structures that resemble their vascular "equivalents". The analogous structures have similar function or macroscopic structure, but different microscopic structure; for example, no thallus has vascular tissue. In exceptional cases such as the Lemnoideae, where the structure of a vascular plant is in fact thallus-like, it is referred to as having a thalloid structure, or sometimes as a thalloid.
Although a thallus is largely undifferentiated in terms of its anatomy, there can be visible differences and functional differences. A kelp, for example, may have its thallus divided into three regions. The parts of a kelp thallus include the holdfast (anchor), stipe (supports the blades) and the blades (for photosynthesis).[2]
The thallus of a fungus is usually called a mycelium. The term thallus is also commonly used to refer to the vegetative body of a lichen. In seaweed, thallus is sometimes also called 'frond'.
^Haupt, Arthur W. (1953). Plant Morphology. New York: McGraw-Hill Book company. p. 7.
^"The term thallus is a botanical term that refers to the body of a plant that does not have leaves". www.botany.hawaii.edu.
January 01, 1970
thallus, this, article, about, undifferentiated, tissue, other, uses, disambiguation, thalli, redirects, here, indian, village, thally, thalli, from, latinized, greek, θαλλός, thallos, meaning, green, shoot, twig, vegetative, tissue, some, organisms, diverse, . This article is about the undifferentiated tissue For other uses see Thallus disambiguation Thalli redirects here For the Indian village see Thally Thallus pl thalli from Latinized Greek 8allos thallos meaning a green shoot or twig is the vegetative tissue of some organisms in diverse groups such as algae fungi some liverworts lichens and the Myxogastria A thallus usually names the entire body of a multicellular non moving organism in which there is no organization of the tissues into organs 1 Many of these organisms were previously known as the thallophytes a polyphyletic group of distantly related organisms An organism or structure resembling a thallus is called thalloid thallodal thalliform thalline or thallose Thallus of Pellia epiphylla Even though thalli do not have organized and distinct parts leaves roots and stems as do the vascular plants they may have analogous structures that resemble their vascular equivalents The analogous structures have similar function or macroscopic structure but different microscopic structure for example no thallus has vascular tissue In exceptional cases such as the Lemnoideae where the structure of a vascular plant is in fact thallus like it is referred to as having a thalloid structure or sometimes as a thalloid Although a thallus is largely undifferentiated in terms of its anatomy there can be visible differences and functional differences A kelp for example may have its thallus divided into three regions The parts of a kelp thallus include the holdfast anchor stipe supports the blades and the blades for photosynthesis 2 The thallus of a fungus is usually called a mycelium The term thallus is also commonly used to refer to the vegetative body of a lichen In seaweed thallus is sometimes also called frond The gametophyte of some non thallophyte plants clubmosses horsetails and ferns is termed prothallus See also editHomothallism Heterothallism WenganiaReferences edit Haupt Arthur W 1953 Plant Morphology New York McGraw Hill Book company p 7 The term thallus is a botanical term that refers to the body of a plant that does not have leaves www botany hawaii edu Retrieved from https en wikipedia org w index php title Thallus amp oldid 1213252014, wikipedia, wiki, book, books, library,
